Added iscellofchar function.

Test if all the elements of a two dimensional cell array are strings.

matlab/utilities/general/iscellofchar.m

+function a = iscellofchar(b)
+
+% Copyright (C) 2012 Dynare Team
+%
+% This file is part of Dynare.
+%
+% Dynare is free software: you can redistribute it and/or modify
+% it under the terms of the GNU General Public License as published by
+% the Free Software Foundation, either version 3 of the License, or
+% (at your option) any later version.
+%
+% Dynare is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
+
+a = 1;
+
+if ndims(b)>2
+    error(['iscellofchar: Input argument ''' inputname(1) ''' has to be a two dimensional cell array!'])
+end
+
+[n,m] = size(b);
+p = numel(b);
+q = 0;
+
+for i=1:m
+    for j=1:n
+        if ischar(b{j,i})
+            q = q + 1;
+        end
+    end
+end
+
+if ~isequal(q,p)
+    a = 0;
+end
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